<template>
  <section class="todoapp">
    <!-- 除了驼峰, 还可以使用-转换链接 -->
    <TodoHeader @addTask="addTaskFn" :list="list" @checkAll="checkAll"></TodoHeader>
    <TodoMain :list="showList" @del="delFn" @change="changeFn"></TodoMain>
    <TodoFooter @changeType="changeTypeFn" :list="list" :type="type" @clear="clearFn"></TodoFooter>
  </section>
</template>

<script>
// 1.0 样式引入
import './styles/base.css'
import './styles/index.css'

import TodoHeader from './components/TodoHeader'
import TodoMain from './components/TodoMain'
import TodoFooter from './components/TodoFooter'

export default {
  components: {
    TodoHeader,
    TodoMain,
    TodoFooter
  },
  data() {
    return {
      list: JSON.parse(localStorage.getItem('todolist')) || [],
      type: 'all' // all 表示全部，yes表示已完成，no表示未完成
    }
  },
  computed: {
    showList() {
      if (this.type === 'yes') {
        return this.list.filter((item) => item.isDone)
      } else if (this.type === 'no') {
        return this.list.filter((item) => !item.isDone)
      } else {
        return this.list
      }
    }
  },
  methods: {
    delFn(id) {
      this.list.filter((item) => item.id != id)
    },
    changeFn(id) {
      const res = this.list.find((item) => item.id === id)
      res.isDone = !res.isDone
    },
    addTaskFn(task) {
      this.list.push({
        id: this.list.length ? this.list.at(-1).id + 1 : 100,
        name: task,
        isDone: false
      })
    },
    clearFn() {
      this.list = this.list.filter((item) => !item.isDone)
    },
    changeTypeFn(type) {
      this.type = type
    },
    checkAll(val) {
      this.list.forEach((item) => (item.isDone = val))
    }
  },
  watch: {
    list: {
      deep: true,
      handler(newVal) {
        localStorage.setItem('todolist', JSON.stringify(newVal))
      }
    }
  }
}
</script>
